摘要
在机载通信领域,迫切需要一种具有垂直极化全向辐射模式的低剖面小型化天线,尤其是在甚高频(Very High Frequency,VHF)频段和特高频(Ultra High Frequency,UHF)频段的低频段.针对这一需求,本文提出了一种有着低剖面、电小尺寸的圆柱腔天线.通过在圆柱腔内部引入短路柱和导电柱分别激励起TM_(01)和TM_(02)模,能够获得良好的垂直极化全向辐射模式.引入锥形套筒在改善输入阻抗的同时,有效降低TM_(01)和TM_(02)模的谐振频率,使两个模式的谐振频率工作在目标频段.另外,设计了4个状态的宽带匹配网络来进一步改善天线的阻抗匹配.本文提出的圆柱腔天线尺寸为π×(0.11λ_(max))^(2)×0.045λ_(max)(λ_(max)是最低频率处的自由空间波长).仿真和实测结果之间有着良好的一致性.实测结果表明,本文提出的圆柱腔天线在低频段和高频段分别获得了47.3%(105~170 MHz)和52.3%(207~355 MHz)的阻抗带宽(|S11|<-10 dB),并在宽频带内获得了稳定的垂直极化全向辐射模式.
In the field of airborne communications,there is an urgent need for a low-profile miniaturized antenna with vertically polarized omnidirectional radiation patterns,especially in VHF and UHF bands.To satisfy this requirement,a cylindrical cavity antenna with a low profile and electrically small size is proposed in this paper.By introducing two short-circuited columns and a conductive column into the cylindrical cavity to excite the TM_(01)and TM_(02)modes,respective⁃ly,good vertical polarization omnidirectional radiation patterns can be obtained.A tapered sleeve is introduced to improve the input impedance and effectively reduce the resonant frequencies of the TM_(01)and TM_(02)modes so that the resonant fre⁃quencies of the two modes can work in the target frequency band.Besides,a broadband matching network with four states is designed to further improve the impedance matching of the proposed antenna.The size of the proposed cylindrical cavity antenna isπ×(0.11λ_(max))^(2)×0.045λ_(max)(λ_(max)is the free space wavelength at the lowest frequency).There is good agreement be⁃tween the simulated and measured results.The measured results show that the proposed cylindrical cavity antenna achieves 47.3%(105~170 MHz)and 52.3%(207~355 MHz)impedance bandwidth in the low-frequency band and high-frequency band(|S11|<-10 dB),respectively,and a stable vertical polarization omnidirectional radiation pattern is demonstrated in the wide frequency band.
作者
王亚鹏
班永灵
孙强
胡俊
WANG Ya-peng;BAN Yong-ling;SUN Qiang;HU Jun(School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu,Sichuan 611731,China)
出处
《电子学报》
EI
CAS
CSCD
北大核心
2023年第10期2754-2764,共11页
Acta Electronica Sinica
基金
国家重点研发计划(No.2020YFB1805003)
国家自然科学基金(No.61971098,No.U19A2055)。
关键词
圆柱腔
低剖面
小型化
全向天线
垂直极化
cylindrical cavity
low profile
miniaturization
omnidirectional antenna
vertical polarization
